title: Total energy expenditure of 16 Chinese young men measured by the doubly labeled water method.
abstract: OBJECTIVE
  Doubly labeled water (DLW) method is the gold standard for measuring total energy expenditure (TEE). We used this method to measure TEE in Chinese young men.
  
  
  METHODS
  Sixteen healthy young men age 23±1 years with body mass index 22.0±1.4 kg/m2 were recruited. TEE was measured by the DLW method, and basal energy expenditure (BEE) was determined by indirect calorimetry. We also conducted 24-h activity, energy balance and factorial approach to estimate energy requirements of the subjects.
  
  
  RESULTS
  TEE of subjects by DLW method was 9.45±0.57 MJ/day (2258±180 kcal/day). The 24-h activity was 10.80±0.33 MJ/day (2582±136 kcal/day). The energy requirement, derived from energy balance observations, was 9.93±1.32 MJ/day (2373±315 kcal/day). The BEE of 6.65±0.28 MJ/day (1589±67 kcal/day), calculated by the adjusted Schofield equation, was significantly higher (P<0.001) than that measured by indirect calorimetry, 5.99±0.66 MJ/day (1433±158 kcal/day). The TEE derived from the factorial approach was 10.31±0.43 MJ/day (2463±104 kcal/day).
  
  
  CONCLUSIONS
  The TEE of Chinese young men measured by the DLW method was about 10% lower than the current recommended nutrient intake (RNI), suggesting that the RNI for Chinese men maybe overestimated. Further studies are warranted to determine the value of the estimated energy requirement.
authors.affiliation: Key Laboratory of Trace Element Nutrition MOH, National Institute of Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhuo
authors.forename: Rui
authors.initials: R
authors.lastname: Sun
authors.forename: Ling Yan
authors.initials: LY
authors.lastname: Gou
authors.forename: Jian Hua
authors.initials: JH
authors.lastname: Piao
authors.forename: Jian Min
authors.initials: JM
authors.lastname: Liu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Yu Hui
authors.initials: YH
authors.lastname: Zhang
authors.forename: Xiao Guang
authors.initials: XG
authors.lastname: Yang
mesh_terms: D044466:Asian People; D004734:Energy Metabolism / Q000502:physiology*; D006801:Humans; D007553:Isotope Labeling; D008297:Male; D009043:Motor Activity / Q000502:physiology; D014867:Water; D055815:Young Adult
chemical_list: D014867:Water
keywords: Chinese young men; Doubly labeled water; Estimated energy requirement; Recommended nutrient intakes; Total energy expenditure